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Recent Changes to Nws Tropical Products and Services

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Recent Changes to Nws Tropical Products and Services RECENT CHANGES TO NWS TROPICAL PRODUCTS AND SERVICES ARRIVAL OF TROPICAL STORM WINDS Wireless Emergency Alerts The NWS will request activation of wireless emergency alerts (WEA) when a Storm Surge or Extreme Wind Warning is in effect. The message on a wireless device within the warned area will read: NWS: Life-threatening STORM SURGE danger. FOLLOW THE INSTRUCTIONS OF LOCAL OFFICIALS. Wireless carriers have not committed to a common date to enable WEA for these warnings. They may be implemented by the wireless carriers at different times. Experimental Graphics Now Operational Graphics help identify when preparations should be complete Potential Tropical Cyclones Earliest Reasonable Time of Arrival of TS-Force Winds What is a Potential Tropical 1 in 10 chance of TS-force winds before this time Cyclone? Most Likely Time of Arrival of TS-Force Winds (not shown) A potential tropical cyclone is a equal chances of TS-force wind before/after this time disturbance that is not yet a tropical NWS is exploring a similar graphic to inform recovery activities cyclone, but one that NHC is issuing advisories and forecasts for 48-HR HURRICANE FORCE WIND because it poses the threat of bringing tropical storm or hurricane conditions to FORECAST land areas within 48 hours. Where and When Can I Find Watch/Warning Information for Potential Tropical Cyclones? All products issued for tropical cyclones will also be issued for potential tropical cyclones. The issuance times for potential tropical cyclone products will be identical to the standard tropical cyclone product issuance times. NWS products for potential tropical cyclones will be issued until watches or warnings are discontinued or until the threat from wind or storm surge (as applicable) for land areas sufficiently diminishes. NHC will provide hurricane-force (64-kt) wind radii Feedback is being solicited on this new through 48h (previously through only 36h). This change capability and messaging should assist forecasters in placing hurricane watches. PROVIDE FEEDBACK ON TROPICAL PRODUCTS AND SERVICES TO [email protected] STORM SURGE WATCH/WARNING Where Can I Find Storm Surge Watch/Warning Information During a Hurricane? • Graphic on NHC website, including downloadable KML file (hurricanes.gov) • National Gridded Forecast Database grid (http://www.nws.noaa.gov/ndfd/) • Approximate representation of the watch/warning area in terms of NWS zones in National and Weather Forecast Office (WFO) TCV products • Approximate representation in the Watch/Warning section of the NHC Public Advisory using coastal breakpoints • NWS WFO Hurricane Local Statements (HLS) Storm Surge Warning (Watch) - The danger (possibility) of life- POST TROPICAL CYCLONE threatening inundation from rising water moving inland from the shoreline within the specified area, generally within 36 (48) REPORT (PSH) hours, in association with an ongoing or potential tropical cyclone, a subtropical cyclone or a post-tropical cyclone. The Storm Surge Warning is the First NWS Grid-Based Warning Storm Surge Watches and Warnings are issued on a grid rather than for entire NWS zones or counties. Users are encouraged to use the Keyhole Markup Language (KML) files available on the NHC website, rather than the Valid Time Event Code (VTEC) in the TCV products, to obtain the most timely and accurate depiction of the Storm Surge Watch/Warning area, Changes to Section E of the PSH: as the VTEC will alert a larger area than intended. Planned Implementation: Fall 2018 Relationship to NWS Coastal Flood Products Name change from “Storm Surge” to If conditions warrant, Coastal Flood products can be issued for “Observed Water Level” an NWS zone when tropical wind watches/warnings are Reports will show the peak reported issued, but not when storm surge watches/warnings are issued. water levels at a site rather than tide The Coastal Hazards Message (CFW) will describe the ranges and storm surge separately of water levels above ground (inundation) during tropical Station ID, lat/long, and source of the events and be horizontally consistent with the TCV and HLS data will be provided products. Feedback is welcome on future improvements KEY MESSAGES KEEPING EVERYONE ON THE SAME PAGE Key messages are provided for tropical cyclones with U.S. watches and/or warnings in the NHC Tropical Cyclone Discussion (TCD). NHC also provides these messages with accompanying graphics via Facebook and Twitter (@NHC_Atlantic) Weather Forecast Offices provide key messages for your local area. You can find key message from your WFO through their social media account(s): weather.gov/srh/tropical#social PROVIDE FEEDBACK ON TROPICAL PRODUCTS AND SERVICES TO [email protected] .
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